<!--  -->
<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        show-icon
      ></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            :options="catelist"
            :props="cateProps"
            v-model="selectedCateKeys"
            @change="handleChange"
          >
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
            <!-- 动态参数表格 -->
            <el-table :data="manyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染tag标签 -->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                  <!-- 输入文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>               
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
            <!-- 静态属性表格 -->
            <el-table :data="onlyTableData" border stripe>
              <!-- 展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!-- 循环渲染tag标签 -->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                  <!-- 输入文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>               
              </el-table-column>
              <!-- 索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close='addDialogClosed'>
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button
        >
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close='editDialogClosed'>
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
        // 商品分类列表
        catelist: [],
        //  级联选择框的配置对象
        cateProps: {
            value: 'cat_id',
            label: 'cat_name',
            children: 'children',
        },
        // 级联选择框双向绑定的数组
        selectedCateKeys: [],
        // 被激活的页签的名称
        activeName: 'many',
        // 动态参数的数据
        manyTableData: [],
        // 静态参数的数据
        onlyTableData: [],
        // 控制添加对话框的显示和隐藏
        addDialogVisible:false,
        // 添加参数的表单数据对象
        addForm:{},
        // 添加表单的验证规则
        addFormRules: {
          attr_name: [
            {required: true,message:'请输入参数名称',tigger:'blur'}
          ]
        },
        // 控制修改对话框的显示与隐藏
        editDialogVisible: false,
        // 修改的表单数据对象
        editForm: {},
        // 修改表单的验证规则对象
        editFormRules: {
          attr_name: [
            {required: true,message:'请输入参数名称',tigger:'blur'}
          ]
        },

    }
  },
  created() {
    // 获取所有的商品分类
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 级联选择框选中项发生变化，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
        console.log(this.activeName)
        this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      console.log(this.selectedCateKeys)
      // 根据所选分类的id，和当前所处的面板获取对应的参数
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params: {sel: this.activeName}})
      if(res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }

      // 赋值之前将每一项进行for循环
      res.data.forEach(item => {
       item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
      //  添加一个布尔值，控制文本框的显示隐藏
      item.inputVisible = false
      // 文本框中输入的值
      item.inputValue = ''
      })
      
      console.log(res.data)
      if(this.activeName === 'many') {
        this.manyTableData = res.data
      }else{
        this.onlyTableData = res.data
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) return
        const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name:this.addForm.attr_name,
          attr_sel:this.activeName
        })
      if(res.meta.status !== 201) {
        return this.$message.error('添加参数失败')
      }
      this.$message.success('添加参数成功')
      this.addDialogVisible = false
      this.getParamsData()
      })
    },
    // 点击按钮展示修改的对话框
    async showEditDialog(attr_id) {
      // 查询当前参数的信息
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params: {attr_sel: this.activeName}})
      if(res.meta.status !== 200) {
         return this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editDialogFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if(!valid) return
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
          attr_name:this.editForm.attr_name,attr_sel:this.activeName
        })
        if(res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应的数据项
    async removeParams(attr_id){
      const confirmResult = await this.$confirm('此操作将永久删除该参数，是否继续？','提示',{
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      // 用户取消了删除的操作
      if(confirmResult !=='confirm') {
        return this.$message.info('已取消删除！')
      }

      // 删除业务逻辑
      const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if(res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点，获着摁下了enter都会触发
    async handleInputConfirm(row) {
      if(row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false 
        return
      }
      //如果没有return，证明输入了内容，需要后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求，保存这次操作
      this.saveAttrVals(row)
    },
    // 将对attr_vals的操作保存到数据库
    async saveAttrVals(row) {
      const {} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals:row.attr_vals.join(' ')
      })

      if(res.meta.status !== 200) {
        return this.$message.error('修改参数失败')
      }
      this.$message.success('修改参数成功')
    },
    // 点击按钮，展示文本输入框
    showInput() {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick方法作用就是当页面上元素被重新渲染之后才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的可选项
    handleClose(i,row){
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    },
  },
  computed: {
      //  如果按钮需要被禁用返回true，否则返回false
      isBtnDisabled() {
        if(this.selectedCateKeys.length !== 3){
            return true
        }
        return false
      },
      // 当前选中的三级分类的id
      cateId(){
        if(this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },

      // 动态计算标题的文本
      titleText() {
        if(this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
  }
}
</script>

<style lang='less' scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px
}
.input-new-tag {
  width: 120px;
}
</style>